Improvement in sewing-machines



3 Sheets-Sheet1. W. WORMALD & E. DOBSON.

1 SEWING-MACHINE. No. 169,881. Patented Nov.9,1875.

FIG].

'3Sheets-Sheet2. W. WORMALD 81E. DOBSON.

SEWING-MACHINE.

Patented-116v. 9, 1875.

- 3Sh et Shee3. W. WORMALD & E. DOBSON.

- SEWING-MACHINE.

No. 169,881. Patented Nov. 9,1875.

NYVPETF-WS, PHOTO-LITHOGJAPHER, WASHINGTON, L C.

"'lv rrnn STATES PATENT -IMPVROVEME-NT IN SEWING-MACHINES.

Specification forming part of Letters Patent No. 169,881, dated November9, 1875; application filed February 13, 1875. i

To all whom it mag] concern:

Be it known that we, WILLIAM WORMALD and EDMUND DOBSON, of Leeds. in thecounty of York and Kingdom of England have invented certainImprovementsin Sewing-Ma chines, of which the following is aspecification:

This invention relates to that class of sewing-machines in which thelooping-hook car= ries the thread around the spool-case and holderyandhas for its object such improvements as will enable the same machine toproduce the lock-stitch from two ordinary reels of thread, withoutnecessitating the rewin din g of the thread into smaller quantities upontemporary reels or other apparatus to suit the machine, as heretofore;also, to produce the cable-stitch from two ordinary reels of thread;also, to produce the chain-stitch with one thread, and to effectsimplicity in construction; and consists, essentially, in the peculiarconstruction and arrangement of the spoolcase holder, provided with aremovable barbshaped piece of metal, the inclination of whichfacilitates the passage of the thread to the back of the needle, andwhich, when producing the cable or single chain or loop stitch, isremoved. The invention further consists in the employment, inconjunction with the spoolcase holder, of an adjustable locking-bolt,having its end enlarged, by means of which the spool-case is held inposition in the holder, and which may be adjusted to allow of thepassage of thread of varying thickness.

But that our invention may be fully understood, we will proceed todescribe the same in detail by aid of the accompanying drawings, inwhich similar letters of-reference are employed to indicatecorresponding parts wherever they may occur.

Figure 1 is a side elevation of a machine constructed according to ourinvention. Fig.- 2 is a front view of the same; and Figs. 3, 4 5, 6, 7,and '8 are detail views.

In order to produce the lock-stitch, we have one reel of thread, A,placed upon a stud, B, fixed on the top of the machine, as usual, andthe thread is passed through or between two washers or disks, 0, fromleft to right. The

vertical needle D is inade flat on one side,'

thus forming a shoulder thereon, and the needlebar is constructedto'receive the needle always in its proper position; The reciprocatingmotion of the needle-bar E is derived from a lever, F, and connectinglink or rod Gr, working upon an eccentric pulley, 1H, fixed upon ahorizontal rotary shaft, J. On the other end of this shaft is aneccentricdisk or stud-plate, K, for working the feeder L, which gives itboth a vertical and horizontal movement, for the purpose of carrying thework along. The movement of the feeder is regulated by means of a grooveor slot, M, being cut in the vertical part thereof; also, a groove beingcut in the stationary body N of the machine, in which rests the end of alever, O, which is capable of being moved up and down by means of ascrew, 1 passed through the other end thereof. On the first-mentionedend of the lever is a pin, Q, which serves as a fulcrum or pivot for thefeeder L, and by raisin g and lowering this pivot, a longer or shorterstroke is effected, and thus the length of the stitch is determined. Tothe aforesaid disk is connected a hook, K, working close to the needle,and capable of entering the loop made by the rising'of the needle. Thishook is curved, and describes an ellipse, or nearly so, in travelingaround the spool-case and holder, and carries the thread in the looparound said spool-case B, or case containing the second reel of thread,one end of which is formed conical for the loop to pass easily on to thecase, and thence forward to the needle, when it enters the second loopand draws up the thread of the first, and so forms the lockstitch. Thisconical spool-case R is provided at one end with a lid, a,'to which isaffixed a spring, having a stud of pin, 11, at its extremity, which,when the lid is in position, fits into and rests in an aperture formedin the spoolcase B for its reception, and this holds the lid securely inposition. The spool-case R is further provided with a vertical,triangular,

or conical metal plate, 0, which has a series of holes formed therein atvarying distances from each other, and by passing the thread through oneof them, either higher up or lower down, the tension of said thread isregulated as required. The spoolcase is held in its proper position,first, by a curved metal plate, 8, at the back of the spool-case holderT, which alsoserves to disengage thethread from the hook K, after thesame has passed around the shuttle. The spool-case R is further securedin position at its front end by.

means of a locking-bolt, d, which fits or rests in a socket formed onthe spool-case holder T, as shown by the drawings. This bolt is providedat one end with an enlarged curved head, formed at right angles, ornearly so, to said bolt, which is held in position by means of aset-screw. By this arrangement the bolt (1 is made adjustablelongitudinally to the spool-case, and by sliding it in or out more orless in the socket, it may be readily adjusted for the passage of threadof varying thicknesses. When the bolt d is adjusted in its properposition, the, enlargement or head projects in front of the spool-caseR, and effectually prevents the same from slipping out. For the purposeof forming the lock-stitch, we secure to the side of the spool-caseholder a barb-shaped piece, V, which forms an incline and facilitatesthe passage of the thread to the back .of the needle. In order toproduce the cable-stitch we remove the barb-shaped piece V beforementioned, and then, instead of 'thei'loop being carried past theneedlegroove before the needle has penetrated a second time to itslowest point, (as is the case in making the loek-stitch,) the loop isheld on one side by the end of the spool-case holder T until'the needlehas passed downa second time and entered the first loop. The second loopis then carried forward by the hook K, which draws up the thread of thefirst loop as before, and so produces the cable-stitch.

In producing the single chain or loop stitch by the same machine, weproceed in the same manner as before described, except that the underthread used for the lock-stitch and double chain-stitch is not used. Thecase may remain in its place and the reel of thread in the case.- Thebarb-shaped piece V is also re moved.

Having described our invention, what We claim, and desire to secure byLetters Patent, 1s

1. The combination of the spool-case holder. T and spool-case R with theadjustable bolt d, all constructed and operating substantially as andfor the purposes specified.

2. In a sewing-machine capable of producing the lock-stitch,cable-stitch, and loop or chain stitch, the combination of thespool-case holder T, curved metal plate 8, the conical spool-ease R,constructed ,substantially as described, and the adjustable locking-boltd, with the removable barb-shaped piece V, all

constructed to operate as set forth.

WILLIAM WORMALD.

EDMUND DOBSON.

Witnesses:

WILLIAM SYKEs WARD, J OHN WILLIAM TASK

